Mitsui Toatsu Chemicals, Incorporated

Hisatomo Sato

Kenji Uchiyama

Shoji Kawasaki

Nobuhiro Hirayama

Hiromi Akiyama

Masaaki Shin

Takashi Yamamoto

Keiichi Ishikawa

Akira Misawa

Kazuo Hisamatsu

Akio Fujiwara

Katuo Uramoto

Shoji Kawaski

A toner composition for electrophotography comprises at least a binder, a coloring agent and optionally a low molecular weight wax in an amount ranging from 0.5 to 20 parts by weight per 100 parts by weight of the binder as essential components wherein the binder comprises, as a principal component, a resin mixture prepared by heating a resin solution comprising a styrene resin and a block copolymer which comprises blocks derived from at least one member selected from ethylenic hydrocarbons and conjugated diene hydrocarbons and blocks derived from styrene and/or a hydrogenated product thereof in an amount ranging from 0.1 to 20 parts by weight per 100 parts by weight of the styrene resin to remove the solvent. The low molecular weight wax may be included in the binder.

Toner composition for electrophotography

The present invention provides electrophotographic toner which comprises as a principal component a mixture of 20-80 parts by weight of a first ethylene polymer (X) whose weight-average molecular weight (Mw) is at least 200,000 and a second ethylene polymer (Y) whose Z average molecular weight/number-average molecular weight (Mz/Mn) is at least 6 and Mw is not greater than 50,000. According to this invention, electrophotographic toner of wide non-offset range can be obtained and, images of stable quality in a low heat quantity, which have not been attained by the prior art, can be obtained.

Electrophotographic toner having two ethylene polymers

Electrophotographic toner composition

Resin composition containing vinyl polymer and olefin polymer for use in electrophotography, electrostatic recording and electrostatic printing and the like, more particularly the resin composition obtained by uniformly dispersing the olefin polymer in the vinyl polymer, and the toner containing this resin composition are disclosed.

Heat fixing electrophotographic toner containing olefin wax

Toner composition for the electrophotography

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Yokohama, Japan

Hisatomo Sato